| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold for vulcanizing a tire tread which effectively restrains the equipment cost from increasing and can sufficiently absorb big fluctuations and changes in the volume of the tire. SOLUTION: The mold for vulcanizing the tire tread is equipped with a plurality of segments 1 which provide the vulcanization and molding for the tread part of a green tire while undergoing such displacement as expansion or contraction of the diameter and while taking a mold clamping posture forming an annular shape as the whole. Each segment 1 is composed as follows. In the inner peripheral side of a holder 2 whose planar shape forms a circular arc, a plurality of molding pieces 3, 4, 5, each having a molding surface, are mutually arranged in an alignment. While the molding pieces 3, 5 positioned at both the end parts of the peripheral direction are fixed to the holder, the molding piece 4, one piece that is positioned between the fixed molding pieces 3, 5, is arranged in the holder 2 to permit free displacement to the radial direction. An elastic means 6 which urges this movable molding piece 4 inwardly to the radial direction is installed, and a restriction means is also furnished which determines, regarding the movable molding piece 4, the projection limiting position to the inner side of the radial direction. COPYRIGHT: (C)2007,JPO&INPIT |
